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Full text of "The manufacture and properties of iron and steel"

METHODS  OF MANUFACTURE.
229
to moisture. Open-hearth slag contains from 35 to 45 per cent, of' CaO and the proportions given will hold good for a rough calculation. The slag will also carry about 16 per cent, of iron, so that it is easy to find what is carried away in the cinder. For special investigation it is necessary to have actual weights and chemical analyses.
In Section Xllb there were given data on pig-and-ore practice" at Steelton, where the gain, in working cold pig was 3.1 per cent arid with liquid metal 4.95 per cent. It was also pointed out that the high content of silicon in the pig-iron caused a loss of iron in the slag and that with low silicon the loss would have been about 7 per cent. In a paper by Mr. Talbot* there are given data on the use of pig-iron with 0.58 per cent, of silicon. Two series of charges are shown, on one of which the weight of the slag is given. Table XII-K gives calculations on the amounts of metallic iron; all estimates are in parentheses. The weight of the slag in the second'
TABLE XII-K. Distribution of the Metallic Iron,in the Talbot Furnace.
Additions, material.	Per cent. Iron.	First Series.		Second Series. '	
		Total added.	Pounds Metallic Iron,	Total added.	Pounds Metallic Iron.
		1,058,100 81,150		1,045,900 19,400	
Cold pig ....................					
Total pig ..............					
	'93.94 99.25 (12.00) (75.00) 58.00 66.80 74.50 (20.00)	1,084.250 22,750 4,140 2,260 89,810 70,150 91,100 28,250	1,084,544 22,579 497 1,695 ' 52,090 46,860 67,795 4,650	1,065,300 49,300 4,440 2,200 112,400 40,000 77,600 -    7,600	1,000,748 48,930 683 1,650 65,192 26.720 57,812 1,520
Scrap ...... ..... ............					
Ferro .......................					
Silico .......................					
Ore. .........  ............ ..					
Cinder..... ...............					
Scale ..... . ....... .........					
Manganese ore ...........					
Total:, .................					
			1,214,710		1,203,100
Ingots ......................		1,146,294 87,805		1,180,950 50,500	
					
Total.... ......... :....					
	99.25	1,184,099	1,175,218 89492	1,181,450	1,172,589 80,511  82,560
Metallic iron not appear-					
Slag= (15.13) per cent. Fe.		219,000	83,135	(215,200)	
					
			6,857 00,52	Excess by calculation. Per cent, excesss ......	2,049 0.17
Per cent, unaccounted for.					
					
* Journal I. and S. I., Vol. I, i&OO.